Inhalation is the process of taking air into the lungs. For this to occur, the air pressure inside the lungs must be lower than that of the external atmosphere as air flows from areas of higher pressure to lower pressure. This is achieved by the contraction of the external intercostal muscles and the relaxation of the internal intercostals which acts to pull the ribcage upwards and outwards, hence, increasing the volume of the thoracic cavity. The diaphragm also contracts to extend the cavity further downwards. Due to the function of the pleural membrane, the size of the lungs is increased which, in turn, creates an area of lower air pressure inside the lungs; hence, air is drawn into the lungs.
Exhalation is the process of expelling air out of the lungs. For this to occur, the air pressure inside the lungs must be higher than that of the external atmosphere as air flows from areas of higher pressure to ones of lower pressure. This is achieved by the relaxation of the external intercostal muscles which bring the rib cage inwards and the diaphragm bulges upwards (recoiling to its original shape) respectively. The internal intercostal muscles contract so as to pull the rib cage further inwards, hence, decreasing the volume of the thoracic cavity and that of the lungs which, in turn, creates high pressure in the lungs; hence air is pushed out of lungs. In passive breathing, the movements of the diaphragm are responsible - the ribs aren't needed.
During inhalation the diaphragm contracts/flattens and pulls the lungs downward increasing their intrapulmonary volume. As intrapulmonary volume increases intrapulmonary pressure drops. As atmospheric pressure is greater than intrapulmonary pressure, air flows down its pressure gradient into the lungs.
During exhalation the process is reversed. Diaphragmatic relaxation compresses the lungs decreasing their volume and increasing their pressure. As intrapulmonary pressure is greater than atmospheric pressure, air once again flows down its pressure gradient out of the lungs.
Inhalation: Intercostal muscles contract- Ribs move upwards - muscles in the diaphragm contract and it flattens - pressure inside lungs drops drawing air down the trachea into the lung.
Exhalation: Intercostal muscles relax- Ribs move downwards - muscles in the diaphragm relax and it becomes dome-shaped - pressure inside lungs increases pushing air up the trachea into the atmosphere.
Inhalation- Air is breathed in through the nose or mouth. It then travels down the trachea, to the lungs (via the bronchi). When it gets to the alveoli, oxygen is put in the oxygen poor blood and swapped for carbon dioxide.
Exhalation- Carbon dioxide is pushed out of your body through the nose or mouth when your diaphragm contracts.
At the site of the alveoli, the oxygen goes into the oxygen poor blood that is coming from all over the body. The carbon dioxide is then forced out and breathed out.
Pressure within the thorax decreases and air is drawn into the lungs
What happens during the G2 phase is that cells grow rapidly and make protein.
What happens during anaphaes
DNA is replicated.Chromosomes are duplicated.During S Phase, there is the occurrence of DNA replication.
menstrual bleeding
This is the phase in which DNA is replicated.
Pressure within the thorax decreases and air is drawn into the lungs
Yes, inspiration is considered the active phase of breathing.
inhalation
The three phases of breathing are:The Active phase which is known as (inhalation/ inspiration).Phase 2. gas exchange in the lungs also known as (Internal exchange).The Passive phase which is known as (exhalation /expiration).
Inhalation is an active process and exhalation is a passive process
The inhalation phase. During the inhalation phase, the diaphragm contracts and this requires energy expenditure. The exhalation phase, on the other hand, only involves passive muscle recoil of the diaphragm and does not require work or energy.
Temperature is constant during a phase change.
Prophase.
DNA replication happens during s-phase.
nothing
Exhaling is expelling used air from the lungs. During exhalation,the diaphragm moves upward while the rib cage moves downward so it goes back to its dome-shaped position
Exhaling is expelling used air from the lungs. During exhalation,the diaphragm moves upward while the rib cage moves downward so it goes back to its dome-shaped position